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Soviet SO class freight steam locomotive of class 2-10-0 (1-5-0) was named in Soviet tradition after the leader – the revolutionist bolshevik Sergo Ordzhonikidze (SO, СО - Серго Орджоникидзе). SO class was developed in 1933 y as the elongated version of very successful E (Э) type of 0-10-0 class of steam engines, the Eu (Эу) series of that was developed and built in Soviet Russia with about 2500 ones were produced in 1926—1930. Original E- class was designed by Russian engineer Łopuszyński, Wacław Marian in 1909. These engines were built from 1912 to 1957 in imperial and Soviet Russia as well as Sweden, Germany, Hungary, Poland, Romania in world record big series with total production exceeds 10853 ones. After start of production by the reconstructed Lugansk Locomotive Plant in Soviet Ukraine of modern powerful 2-10-2 class FD freight locomotives with many construction innovations it became necessary to create locomotive of simplified design, which could be built at all plants and operates without rebuilding depots, turntables and track superstructure, but be more powerful than obsolete E-series. To obtain this Research Institute of Traction Reconstruction of the NKPS developed a preliminary design of a new 2-10-0 type locomotive based on an E-series steam locomotive which boiler was increased that lead to general frame elongation and inreased weight that need addition of the leading wheel that was taken from the Su-class of passenger locomotives of the 2-6-2 class also developed before The Great October revolution. The detailed design and working drawings were made by a team of designers of the Kharkov Locomotive Plant under the leadership of P.M. Sharoyko. Many technical improvemets have been made after start of locomotive production in 1934. SO18 (CO18) was the latter series of SO17 (СО17) engine, with some improvements and increased rail load up to 18 t. A total production of SO built by 6 plants was 4487 ones.
Soviet SO class freight steam locomotive of class 2-10-0 (1-5-0) was named in Soviet tradition after the leader – the revolutionist bolshevik Sergo Ordzhonikidze (SO, СО - Серго Орджоникидзе). SO class was developed in 1933 y as the elongated version of very successful E (Э) type of 0-10-0 class of steam engines, the Eu (Эу) series of that was developed and built in Soviet Russia with about 2500 ones were produced in 1926—1930. Original E- class was designed by Russian engineer Łopuszyński, Wacław Marian in 1909. These engines were built from 1912 to 1957 in imperial and Soviet Russia as well as Sweden, Germany, Hungary, Poland, Romania in world record big series with total production exceeds 10853 ones. After start of production by the reconstructed Lugansk Locomotive Plant in Soviet Ukraine of modern powerful 2-10-2 class FD freight locomotives with many construction innovations it became necessary to create locomotive of simplified design, which could be built at all plants and operates without rebuilding depots, turntables and track superstructure, but be more powerful than obsolete E-series. To obtain this Research Institute of Traction Reconstruction of the NKPS developed a preliminary design of a new 2-10-0 type locomotive based on an E-series steam locomotive which boiler was increased that lead to general frame elongation and inreased weight that need addition of the leading wheel that was taken from the Su-class of passenger locomotives of the 2-6-2 class also developed before The Great October revolution. The detailed design and working drawings were made by a team of designers of the Kharkov Locomotive Plant under the leadership of P.M. Sharoyko. Many technical improvemets have been made after start of locomotive production in 1934. SO18 (CO18) was the latter series of SO17 (СО17) engine, with some improvements and increased rail load up to 18 t. A total production of SO built by 6 plants was 4487 ones.